What is your current system and does it heat and cool both upstairs and downstairs satisfactorily?

Don't know that answer, my moms condo we are redoing. The ac unit outside I believe original from the 80's. I know she was always comfortable heat wise she was pretty frugal on that ac though. One of the questions is though if the systems were being compared Apple to Apple would you consider Trane better than Bryant or other way around? To tell exactly what system is would have to drive out, which I can do over weekend. But thoughts on Bryant vs Trane?

Trane properly sized...you definitely don't need a 100 KBTU furnace....request written load calculation both cooling and heating....is condo a standalone or does it share walls with other units?...your Mom's HOA allows high eff furnaces?...many don't...this furnace would require Trane's 824 thermostat....you would want a properly sized whole house filter cabinet...where will furnace be located?...it would be helpful to know what size AC and furnace including eff does your Mom have now?

IMO

Was a load calculation done? If you have high humidity then you want to make sure the AC is not over sized. Get a quote on a 2-stage AC. It is going to be more money but it will perform better for humidity removal.

I think the Bryant guy wants to use a 5 ton coil with the 4 ton condenser. He might be doing that to reach a SEER 16 rating. But that size coil be only fit a 100K furnace, or he is too lazy to do fabricate a transition duct to fit a 80K furnace. Whatever the reason the furnace is over sized.

Don't buy the wrong equipment to get a rebate. The extra cost of operating over sized will swamp out any rebate savings over the life of the equipment.

Bryant is pretty much carrier. Really no difference between system performances with the compared units. Carrier parts are alot easier to obtain when needed than trane products.

www.heating-repair-chicago.com

Just to note, oversizing either the AC or furnace is not good, which is why the folks above are concerned.

Oversize the AC, it can freeze up and become inoperable or it short cycles.

Oversize the furnace, lowers life expectancy due to heat exchanger being exposed to more heat than normal, also short cycles.

And for these reasons, load calcs are always recommended. It is possible to undersize as well, but not as common.

Do a Free load-calc http://www.loadcalc.net/

Oversizing the AC will not cause it to freeze up. The AC freezing up is an entirely separate issue, that must be properly diagnosed.

Oversizing the AC will cause it to short cycle, higher than normal light bills, higher than normal humidity levels in the home if in a humid climate. During shoulder seasons an over sized AC will most likely turn your home in to a tropical rain forest during high humid periods. This can lead to mold growth on closet walls, poor indoor air quality and a slew of health and respiratory ailments to go with it.

In a non-humid climate the over sized AC will short cycle, higher than normal light bills.

Both over sized AC systems regardless of climate will most likely have premature compressor failure because of short cycling during cooler periods of the year the oil with in the refrigeration system migrates out of the compressor crankcase and because the system runs shorter does not have enough time to return the oil back to the compressor.

To test the theory you could:

Drain the motor oil from your car and then take a vacation. Then post back and let us know how far you made it.

Magic 8 ball says: not very far.